Thermostat.



P ATENTED OCT. 2; 1906.

L.- e; BYOB THBRMOSTAT. APPLICATION FILED MAY19,1905.

. mfnessfs,

nected with n Addie "i No. assess.

Specification of Letters Patent.

ented'flct. .2, 1998.

application filed they 19, 1905. Eerial illo- 251,273:

T0 to whom it may concern.- Be it known that I, LYMAN C. Bron, a citizen of the United States, residing at Petalunia, in the county of Sonomaand State of California, have invented new and useful Improvements inThermostats, of Whichthe following is a specification. I

My invention relates to thermostats or temperature regulators, andespeciall to such as are designed for in the eg whambers of incubatorsand other compartments where a uniform temper ture is desired oressential.

The object of my invention is to-provide a heat-regulating device whichshall be durable, delicate, and practical and which shall be simple andcheap to manufacture.

' It consists of the parts and the construction and combination ofparts, as hereinafter more fully described and claimed. and havingreference to the accompanying drawings, in which- Figure 1 shows disksin section.

Fig. 2 is 8. perspective VIGVV of connecting-nipple considerablyenlarged. Fig. 3 is an elevation of my thermostat. Fig. 4 is a sectionalview of supporting e nipple considerably enlarged. Fig. 5 is adiagrammatic view of an incubator, showing thermostat in workingposition. It is common to employ in incubators a source of artificialheat, such as an oil-lamp,

and to regulate the heat passing therefrom to the egg-chamber by somesort of thermostat arrangement disposed usually in or conthe eggchamber. Usually these thermostats are com osed of expansi ble unitscomposed each of two thin springmetal disks oppositely convexed andcorrugated, secured together at their peripheries and otherwisehermetically sealed to form a chamber containing air or other suitableeX- The disks of a unit are generally secured together only at theiredges by solder, in either case they have only a limited area of mutualcontact, or, touch each other only in a comparativelv thin continuousline. The result is that with the constant expandin and contracting ofthe disks by the variations in temperature the disks work on each otherat these points as on an annular fulcrum, and it is not long before-theseam is broken and the air-chamber of the unit leaks. Lots of troublehas resulted from leaking thermostats of this conand sometimes they arecrimped but in other words, they struction, and l have been led todevises means to overcome the difficulty. 1 v

In carrying out this partcf my inventionl take two thin, preferablycorrugated, springrnetal disks, as A A, and form each with spposedtelescoping annular peripheral flanges 2 2. The 2 of the female member Ais preferably of a length equal to the desired thickness oithe completedunit andbears against the opposite A", proximateto the base of flange 2,to form a spring memher or in assembling the parts. The flange 2 l themale member A." is of such length only as to give thisfia-nge asuhstantial surface. of contact with the flange 2 one flange on theother when the parts are soldered together. With the flanges sol deredtogether they form really a double rigid wall haying little or no springand-are entirely unaffected by the expansion and contraction of thelluid in the thermostat-charm.

'her, expansion and contraction being provided for by the concentriccorru ations of the two disks and the expansion. an contraction takingplace in the line oft-he axis of the disks, as contemplated.

Access to or communication with the chamber formed by the disks for anyreason is had by means oi a solid eXteriorly-thread-. ed nipple 3,preferably of brass, which is soldered centrally to the outside of oneof the disks, as A. The end oi this nipple is di pad in a bath of softmetal or alloy-such as ead, Babbitt solder, or the lilreto form a skinor coating 4. of suitable thickness. The nipple and disk are then tappedcentrally. and threaded to receive a hard metal screw-plug 5, having anannular ledge or head 6, which on being screwed down tight on the softout side metal on the end. of the nipple forms an air-tight seal andabsolutely prevents any leak from the chamber formed by the subsequentlyassembled and soldered disks.

. I am aware thatit is old to close anorifice by means of a soft-metalhall or shot seating in the orifice and a plug to compress or squeeze heshot to its place. This form'of closure has been found objectionablein'prac tics, because in case the closure is not made absolutely tightand the plug has to be taken out for any reason it is almost impossibleto dig the shot out after it has once been compressed in itsseating-chamber. By my ar-' rangement the soft-metal seat is not in anyoutside the nipple, y matter to redip the nipple, ithout danger ofseriously pluggin" "iii-cc in the nipple. Furthermore, il mic o the softmetal does get onto the threads in the orifice it acts to make the jointbetween the nipple and plug 5 tighter.

l fherc the range of expansion and con. traction aihu-ded by a singleunit is insufficient, several connected units may be used, as shown inFig. 3, the outermost disk of only one ol the units having ascrew-threaded nipplo. These multiple-unit thermostats are coniwctml inthe Following fashion:

llach unit is made up of two disks having telescoping firing-es, asfirst mentioned. The adjacent disks or the top and bottom disks ofadjacent units are perforated and connected by 1 tubular section 7, ofstamped metal, iitting these perforations, the end of the secd orotherwise comiectcd to the respective disks to form tight joints.

When the tubular sections '7 are stamped out or otherwise made, thcyhaveeach an ex- ;crnol annular llangc :4 one 1 id and con.- E-roctcd portionit he oppo 3 end.

in cons cting a thcrmoeuet 03' this multiple charact one of the diskswhich corre- .1 ponds, say, to the female member A of one unit in eperforation through which a sec- (ion 7 ed trom what will eventually be(he in o ol the disk and the flange 3 slu against the disk and. solderedin. pi i 'iis leatves this disk with the tube ling through and beyond adistance equal-lo the splice between. this disk and the succmidirigadjacent unit. The male incinher I. of the adjacent unit has a smallerporloration, into which the reduced portion 9 of the tube-section 7 willlit. YVhen the end 9 has been soldered to the disk A, l have two elemenof two adjoining units connected by a tube- 1'.

Other disks and tubes are similarly assembled, and the male and femalemembers of any two of these incomplete assemblages may then be united,es first described, by soldering or other means. The bottom (lid; of theloweri'nost unit may be plain, and the upper disk ol" the topmost unitmay be provided with a soit-rnetahtipped nipple 3, closed by a plug 5,all the chambers of the several units being in con'imunicationthroughthe several tul c-sections 7 and the one plug 5 serving to honmglicallyseal all the units.

The purpose of externally threading inc nipple i is to enable ti .1:device to be conveniently nod rigidly si ipporred, as by screwing thenipple into a suitable threaded socket in a stationary support 10. Theresult of ex pension and contraction of the unit or units is thentransmitted by suitable connections with the opposite end of thethermostat to regulate the valves, dampers, or other appliances ormechanisms whichv it may be desired to control. As here illustrated, acounterweighted lever 11 is fulcrumed at 12 and connected with a damper13 over the flue 14 by a link 15. Heat generated from any suitablesource may pass through flue 14 into the egg-box V by way of the passage17 or out to the open air by a shorter passage when the damper isopened. A rod .8 is carried by the delicately-poised lever 11 and has abutton 19 hearing continually on the under side of the regulators. Anincrease in temperature in the box 16 will cause the air or other fluid.in the regulator to expand and press the flexible disks outward tooperate through red 18 to open the damper 13. When the chamber of box16' cools, the regulator will contract and allow the damper to closemore or less.

Having thus described my invention, what i claim, and desire to secureby Letters Patent, is-

An improved thermostat consisting of pairs of metallic disks each havingperipheral flanges one fitting Within the other and rigidly connected,said disks being corrugated in concentric lines; on exteriorly-threadcdnipple carried by one of the disks and having an intern ally-threadedorifice which communicates with the ch ember inclosed by the disks, saidnipple having its outer end provided with a permanently-attached skin orcoating of soft compressible metal it screwplug fitting said orifice andseating on said metallic coating and being freely removable a supportfor the thermostat having an intcrnally-threaded socket into which saidnipple screws; a sleeve between each pair of disks said sleeve havingtwo diameters the larger of which fits a corresponding perforation inone of the disks andthe smaller fits a like perforation in the otherdisk, said sleeve having a flange surrounding the base: of its largerdiameter and adapted to abut against the inner side of its disk, and theportion of the smaller diameter projecting beyond the outside of saiddisk and adapted to be permenently fitted to a perforation in the adjacent disk.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit- IIGSSGS.

. LYMAN O. BYOE. Witnesses:

W. D. HOUX, GEO. W. Roonrmvn'n

